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Phase Formation, Microstructure and Setting Time of Mcm-48 Mesoporous Silica Nanocomposites With Hydroxyapatite for Dental Applications: Effect of the Ca/P Ratio Publisher



Lenji RK1 ; Nourbakhsh AA1 ; Nourbakhsh N2 ; Nourbakhsh M3 ; Mackenzie KJD4
Authors
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Authors Affiliations
  1. 1. Department of Material Science, Shahreza Branch, Islamic Azad University, Isfahan, Iran
  2. 2. Torabinejad Dental Research Center, Department of Pediatric Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, New Zealand

Source: Ceramics International Published:2017


Abstract

Nanocomposites of MCM-48 mesoporous silica and hydroxyapatite (HA) are investigated as possible alternatives for the commonly used Mineral Trioxide Aggregate (MTA) dental cement, and the effect of their Ca/P ratio on their structure, properties and setting times is reported. XRD, FTIR and EDS/SEM analysis of the nanocomposites indicate that crystalline HA is formed within the mesoporous silica structure. High Ca/P ratios lead to the formation of free CaO within the nanocomposite, decreasing its setting time; the shortest setting time (~ 40 min), which occurs in the MCM-48/HA nanocomposite with a Ca/P ratio of 5, in physiological saline solution, is considerably shorter than the setting time of MTA (~ 140 min under identical conditions). Thus, the shorter setting time of the MCM-48/HA nanocomposites, coupled with their lack of toxicity, high degree of bioactivity and their stability in tissue fluids, suggest that they could serve as a useful replacement for MTA. © 2017 Elsevier Ltd and Techna Group S.r.l.
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